There's also the verb 'divertir', which means 'to entertain', and can be used passively (divertir-se) to mean someone is having fun. for instance, when in english you would say i'm having fun in spanish it would be me estoy divirtiendo conjugated as follows yo me divierto el/ella se divierte ellos/ellas se divierten nosotros nos divertimos ustedes se divierten

Well, Fun is a noun, so it means in spanish "Diversión" ans Funny would be an adjective, so it means "Divertido". Yo use fun, when it is the object that make the action in spanish. And you use "divertido" in spanish with To Be verb (Ser o Estar in spanish).

fun is "diversión" it´s a noun and funny is "divertido" an adjective

fun would be "divirtido" while funny would be "comico" or "gracioso".

fun = diversión, relajo, esparcimiento funny = 'chistoso'(M), 'chistosa' (F), like a comediant, joke, movies, etc. You may also have fun without laughing, like going out to parties, playing sports, travelling, etc.